>>> tomorrow night on the heels of the one-month anniversary of the massacre at sandy hook, joe biden hands his recommendations on gun violence, i'll host a live one-hour special. "guns in america." i'll be talking to people on both sides, including maryland attorney general beau biden who says military style assault weapons have no place on the streets, his own brother is a casualty of gun violence that says that the victims in newtown are being used by propaganda. the families of the victims of the aurora movie theater massacre. be part of a live audience in my new york city studio. go to my website for details. that's all for us tonight. "ac 360" starts now. "ac360" starts now. >>> the crowds and reporters and law enforcement personnel are gone but the pain for many families remains. for the first time today in this town hall behind me, family members of 11 victims of the shootings appeared to start what they hope becomes a national conversation, a conversation about mental health and school safety and what they call gun responsibility. you'll hear from a number of families tonight